Chevrolet Tavera BS3 Owner's Manual page 140

Valve clearance adjustment D
1. Bring the piston in the No. 1 cylinder to the top dead center (T.D.C.) on
compression stroke by turning the crankshaft until T.D.C. line on damper
pulley is aligned with the timing pointer.
Check the rocker arm shaft bracket nuts for looseness and retighten as
necessary before adjusting the valve clearances.
2. Adjust the valve clearances in the following manner using a feeler gauge.
Valve clearance: mm. (in.) [at cold]
Intake
0.40 (0.016)
Exhaust 0.40 (0.016)
134
CAUTION